Oh, thanks, I was only aware of San Diego and Nagoya. Are the others relatively new? This is maybe an example of a species previously extremely rare in collections and that increased noticeanle recently, it is? Would be nice to start a thread about such kind of species (or already exist one?)
Regarding the subject of this thread, I see many people talk not only about common animals they never seen in a zoo, but also common animals they saw very few times or long time ago.
For me, this animal is the racoon dog or tanuki. Seen only at Oasys del Teide, a fairly small zoo in Canary Islands, in 2003. Never since then (I also failed to find their enclosure at Pairi Daiza). However, according to ZTL they're one of the most commonly kept canids in zoos.